<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <input type="checkbox" id="jack" value="1" v-model="chenckList">
        <label for="jack">Jack</label>
        <input type="checkbox" id="john" value="2" v-model="chenckList">
        <label for="john">John</label>
        <input type="checkbox" id="mike" value="1" v-model="chenckList">
        <label for="mike">Mike</label>
        <br>
        <span>Checked names: {{ chenckList }}</span>
    </div>
    <script>
        const vm = new Vue({
            el:'#app',
            data () {
                return {
                  chenckList: ["1" ]
                }
            }
        })
    </script>
</body>
</html>